Abstract
Investigating single-electron transport and quantum interference in low-dimensional systems is central to understanding emergent quantum phases and developing high-precision electronic and spintronic devices. In this context, recent advances in van der Waals (vdW) assembly have enabled the realization of artificial layered systems with highly tunable electronic properties, providing a new platform to study single-electron transport and quantum interference effects. In this talk, I will discuss ongoing efforts and future directions to explore these effects in vdW heterostructures with engineered topology. In the first part, we employ graphene/WSe2 heterostructures to realize gate-tunable quantum point contacts for quantum Hall interferometry, where proximity-induced spin–orbit coupling (SOC) can act as an effective magnetic field to induce additional phase shifts in oscillations. We then extend this platform to rhombohedral multilayer graphene aligned with hBN, whose flat bands and interaction-driven valley polarization produce an interaction-driven quantum anomalous Hall effect with nontrivial topology at zero magnetic field. In the second part, we study single-electron transport in gate-defined quantum dots in these systems to probe topological effects at the level of individual electrons. Finally, I will outline prospects for extending these studies to non-graphene-based heterostructures, such as twisted MoTe2 with non-trivial topology and strong correlations. Through these studies, we aim to elucidate coherent transport and topological states in 2D materials at the single-electron level and to establish vdW heterostructures as a versatile platform to explore correlated flat-band physics, single-electron charging, and coherent transport in strongly interacting 2D systems.
Anyone interested is welcome to attend.